Buggy code:
public final class ClassFinder { private static final Logger log = LoggingManager . getLoggerForClass ( ) ; private static final String DOT_JAR = ".jar" ; private static final String DOT_CLASS = ".class" ; private static final int DOT_CLASS_LEN = ClassFinder . DOT_CLASS . length ( ) ; private ClassFinder ( ) { } private static class FilterTreeSet extends TreeSet < String > { private static final long serialVersionUID = 234L ; private final Class < ? > [ ] parents ; private final boolean inner ; private final String contains ; private final String notContains ; private final transient ClassLoader contextClassLoader = Thread . currentThread ( ) . getContextClassLoader ( ) ; FilterTreeSet ( Class < ? > [ ] parents , boolean inner , String contains , String notContains ) { } @ Override public boolean add ( String s ) { } } private static class AnnoFilterTreeSet extends TreeSet < String > { private static final long serialVersionUID = 240L ; private final boolean inner ; private final Class < ? extends Annotation > [ ] annotations ; private final transient ClassLoader contextClassLoader = Thread . currentThread ( ) . getContextClassLoader ( ) ; AnnoFilterTreeSet ( Class < ? extends Annotation > [ ] annotations , boolean inner ) { } @ Override public boolean add ( String s ) { } } public static List < String > findClassesThatExtend ( String [ ] paths , Class < ? > [ ] superClasses ) throws IOException { } private static String [ ] addJarsInPath ( String [ ] paths ) { } public static List < String > findClassesThatExtend ( String [ ] strPathsOrJars , final Class < ? > [ ] superClasses , final boolean innerClasses ) throws IOException { } public static List < String > findClassesThatExtend ( String [ ] strPathsOrJars , final Class < ? > [ ] superClasses , final boolean innerClasses , String contains , String notContains ) throws IOException { } public static List < String > findAnnotatedClasses ( String [ ] strPathsOrJars , final Class < ? extends Annotation > [ ] annotations , final boolean innerClasses ) throws IOException { } public static List < String > findAnnotatedClasses ( String [ ] strPathsOrJars , final Class < ? extends Annotation > [ ] annotations ) throws IOException { } private static List < String > findClassesThatExtend ( String [ ] strPathsOrJars , final Class < ? > [ ] classNames , final boolean innerClasses , String contains , String notContains , boolean annotations ) throws IOException { } private static List < String > getClasspathMatches ( String [ ] strPathsOrJars ) { } private static String fixPathEntry ( String path ) { } private static boolean isChildOf ( Class < ? > [ ] parentClasses , String strClassName , ClassLoader contextClassLoader ) { } private static boolean hasAnnotationOnMethod ( Class < ? extends Annotation > [ ] annotations , String classInQuestion , ClassLoader contextClassLoader ) { } private static String fixClassName ( String strClassName ) { } private static void findClassesInOnePath ( String strPath , Set < String > listClasses ) throws IOException { File file = new File ( strPath ) ; if ( file . isDirectory ( ) ) { ClassFinder . findClassesInPathsDir ( strPath , file , listClasses ) ; } else if ( file . exists ( ) ) { ZipFile zipFile = null ; try { zipFile = new ZipFile ( file ) ; Enumeration < ? extends ZipEntry > entries = zipFile . entries ( ) ; while ( entries . hasMoreElements ( ) ) { String strEntry = entries . nextElement ( ) . toString ( ) ; if ( strEntry . endsWith ( ClassFinder . DOT_CLASS ) ) { listClasses . add ( ClassFinder . fixClassName ( strEntry ) ) ; } } } catch ( IOException e ) { <START_BUG> ClassFinder . log . warn ( ( ( ( "Can<seq2seq4repair_space>not<seq2seq4repair_space>open<seq2seq4repair_space>the<seq2seq4repair_space>jar<seq2seq4repair_space>" + strPath ) + "<seq2seq4repair_space>" ) + ( e . getLocalizedMessage ( ) ) ) ) ; <END_BUG> } finally { if ( zipFile != null ) { try { zipFile . close ( ) ; } catch ( Exception e ) { } } } } } private static void findClassesInPaths ( List < String > listPaths , Set < String > listClasses ) throws IOException { } private static void findClassesInPathsDir ( String strPathElement , File dir , Set < String > listClasses ) throws IOException { } }

Fix:
ClassFinder . log . warn ( ( ( ( "Can<seq2seq4repair_space>not<seq2seq4repair_space>open<seq2seq4repair_space>the<seq2seq4repair_space>jar<seq2seq4repair_space>" + strPath ) + "<seq2seq4repair_space>" ) + ( e . getLocalizedMessage ( ) ) ) , e ) ;